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Does anybody know?

Can't seem to find out anywhere.

Four main areas:

1. Isocylinder line: More = more distrotion

2. Vector plots: Shows amount (by length) and orientation of aberrational astigmatism. Vertical lines are desirable

3. ADD...

What is the fitting cross on a PAL?

It does not contain the distance Rx but it is the point where the px looks through. So whats the optical principle behind it?

Cheers friends.